1.) Helper-Springs (spiral auxiliary springs)Auxiliary springs are not adjustable.Auxiliary springs are installed in addition to the existing leaf springs or spiral springs / coil springs.Auxiliary springs largely hold the vehicle height with heavy load, the spring travel is thereby increased with heavy load.Auxiliary springs have a payload, so the vehicle is unloaded to be pleasant to drive.In the case of very heavy and continual loadings, special auxiliary springs can be used; these special springs are only loaded to drive.

2.) Semi-air-springs (Additional air springs, Auxiliary air springs)Semi-air springs are also installed in addition to the existing leaf springs or spiral springs / coil springs.Semi-air springs keep the vehicle height at high payloads, thus increasing the travel of the suspension when the load is heavy.The effect can be conveniently adjusted as required on semi-air springs with a built-in compressor.The compressor can be supplied as a 1-circuit system (both sides the same) or as a 2-circuit system (left and right separately). Semi-air springs are a good solution for all vehicles.Also ideal for pick-ups with residential cabins or for mobile homes.

3.) Full air suspensionFull-air springs replace the existing springs.The adjusted vehicle height is automatically maintained.When the vehicle is stationary, the vehicle can be lowered, which is loaded and contained.